Improvement in telegraph-insulators



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MERRITT L. WOOD, OF ITHACA, NEW YORK, ASSIGNOR TO HIMSELF, SAMUELPORTER, AND L. M. MONROE.

l Letters Patent No. 71,564, dated November 26, 1867.

IMPROVEMENT IN TBLEGRAPH-INSULATORS.

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IO ALL WHOM IT MAY CON CERN: l

Beit known that I, MERRITT L. WOOD, of Ithaca, Tompkins county, Stato ofNew York, have invonted certain new and useful Improvements inTelegraphic Insulators; and I do hereby declare the followingdescription and accompanying drawings are sufficient to enable anyperson skilled in the art or science to which it most nearly appertainsto make and use my said invention or improvements without furtherinvention or experiment.

The nature of my invention consists in va conical-shaped iron case, madelargest at the upper end, to be applied to a wooden standard, providedwith a wedge, which is forced in by the ease when it is forced on to thestandard to spread the end of the standard into the upper end of thecase, and hold it rmly on the standard, and in making a groove aroundthe standard that supports .the case or insulator, which may be filledwith paraiiine or other' suitable material; and in preparing thestandard with paraine or other insulating substance before the insulatoris applied; and in ri'b or collar on the wooden standard under the baseof the' insulator. In the accompanying drawings-v Figure 1 is anelevation of my improved insulator on a standard.

Figure 2 is a section of the insulator with a standard in it.

In these drawings, A is the top of the insulator, to which the standardor support is fitted, and B thc enlarged base, both of which may be madeof cast iron or other metal, in the form shown, or in such other form aswill answer the purpose. The top, A, is about one and one-half inch indiameter at the top, and one-fourth of an inch smaller where itjoins thebase B, which swells out somewhat in a hcmispherical form to two andone-half inches in diameter. The heights ofthe top and base are abouttwo inches each, making the insulator about four inches long.4 The metalmay be about one-eighth of aninch, or a little less, in thickness. Imake two hooks or horns, C C, on the base, just below where itjoins thetop, and curve the horns in towards the top, as shown in the drawing,and arrange them in such a position that they will press the wire Dagainst the insulator, at Yor near where the top joins the base,so thatthe wire cannot he raised above the points of the horns without beingbent considerably, so that when the wire is put in, and drawn asstraight as the horns will permit, it will be held firmly by theinsulator. This insulator is coated or lined with porcelain, int,felspar, glass, or other insulating substance, on the inside, in themode well known and practised by furnace-men, to insulate it from thestandard F, which is made of wood, in the form shown in the drawing,with the upper end tted to the top A, and an enlargement, G, under thebase B, covered and protected by it. The top of this enlargement ishollowed out to form a circular trough around the standard F, which I llwith paraiue, rosin, or some other suitableA material impervious'towater, and which will prevent the rain which gets on the standard fromascending the wood and soaking up into the standard F so freely as itmight do, without the parafine. The whole of the upper end of thestandard may'be soaked in parafline before the insulator is applied,down a little belowthe trough, if preferred that way. Beforethe'insulator is put on the standard, it is sawed or split, and thewedgeH entered, so that as the insulator is driven down or forced on, thewedge is forced in, whielrspreads the end of the standard in theinsulator, which is made largest on the inside at the upper end, so asto be held rrnly on the standard by the wedge. Myimproved insulator willbe stronger if made of cast' iron,rendered malleablcin the manner wellknown and practised. i

I claim, in combination with the conical-shaped iron insulator A, thewedge II, inserted in the top of the standard or support, in the mannerand for the purpose as set forth. Y

I also claim the groove N around the standard F, for holding parailineor other suitable material, for the purpose set forth.

MERRITT L. WOOD.

Witnesses:

FRANCIS M. FrNcH, WALTER C. GURRAN.

